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Why iodobenzene cannot be prepared direc...

Why iodobenzene cannot be prepared directly by combining benzene and iodine in presence of iron fillings ? Why is this reaction possible in presence of nitric acid ?

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Iodobenzene cannot be directly prepared by combining benzene and iodine because the reaction is reversible in nature. However, in presence of nitric acid, this reaction becomes possible because nitric acid oxidises the hydrogen iodide as it is formed and so drives the reaction to the right.
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